The Google Webmaster Tools announced you can now get +1 metrics directly in your Google Webmaster Tools account.
Currently it only works with +1s and shows you three reports, they include:
- The Search Impact report gives you an idea of how +1's affect your organic search traffic. You can find out if your clickthrough rate changes when personalized recommendations help your content stand out. Do this by comparing clicks and impressions on search results with and without +1 annotations. Google will only show statistics on clickthrough rate changes when you have enough impressions for a meaningful comparison.
- The Activity report shows you how many times your pages have been +1'd, from buttons both on your site and on other pages (such as Google search).
- Finally, the Audience report shows you aggregate geographic and demographic information about the Google users who've +1'd your pages. To protect privacy, Google will only show audience information when a significant number of users have +1'd pages from your site.
Here is a screen shot:
For more details on these reports, see Google's help section.